os: Add -displayfd into -help text
Add -displayfd into -help text. It was mentioned in the man page but seem to have been missed from the -help text. Signed-off-by: Keith Packard <keithp@keithp.com>
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				|  | @ -529,6 +529,7 @@ UseMsg(void) | |||
|     ErrorF("-cc int                default color visual class\n"); | ||||
|     ErrorF("-nocursor              disable the cursor\n"); | ||||
|     ErrorF("-core                  generate core dump on fatal error\n"); | ||||
|     ErrorF("-displayfd fd          file descriptor to write display number to when ready to connect\n"); | ||||
|     ErrorF("-dpi int               screen resolution in dots per inch\n"); | ||||
| #ifdef DPMSExtension | ||||
|     ErrorF("-dpms                  disables VESA DPMS monitor control\n"); | ||||
|  |  | |||
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